Indexed by:期刊论文

Date of Publication:2009-11-01

Journal:OPTICS AND LASER TECHNOLOGY

Included Journals:SCIE、EI、Scopus

Volume:41

Issue:8

Page Number:985-989

ISSN No.:0030-3992

Key Words:Photoelastic material fringe constant; Least-squares method; Digital photoelasticity

Abstract:A nonlinear least-squares method was applied to determine the photoelastic fringe constant from isochromatic phase field obtained by digital phase-shifting photoelasticity. To perform automatic evaluation, not only the photoelastic fringe constant but the center coordinates of a disk under diametral compression are also determined simultaneously using the nonlinear least-squares method. A set of over-determined nonlinear equations is obtained to estimate the unknown parameters by an iterative procedure based on Newton-Raphson method. Simulation and experimental results show that the parameters are evaluated accurately from the isochromatic phase field obtained from the phase-shifting photoelasticity. The photoelastic fringe constant and the disk center coordinates can be evaluated easily, simply and automatically by the technique. (C) 2009 Elsevier Ltd. All rights reserved.